The Fox 36 Factory GRIP2 is a premium-level suspension fork renowned for its high adjustability, stiffness-to-weight ratio, and race-proven GRIP2 damper. Designed for aggressive trail and enduro riders, regular inspection and maintenance of this fork is crucial to preserve performance, safety, and component longevity. This guide walks through the complete process of inspecting the Fox 36 Factory GRIP2 fork, identifying potential issues, and understanding compatibility and performance optimization steps.
Tools Required
- Torque wrench [paid link] with appropriate bits (3mm, 4mm, 5mm, 6mm hex)
- Clean rags or shop towels
- Suspension-specific cleaner or isopropyl alcohol
- Suspension oil level gauge or syringe
- Rubber mallet (for lower leg removal)
- Shock pump (for air pressure check)
- Digital caliper [paid link] (optional, for wear checks)
- Fox 36 fork service manual (for reference)
Initial Fork Inspection: What to Check
Routine inspections of the 36 Factory GRIP2 should begin with visual and tactile checks. Look for signs of wear, contamination, and structural issues that could compromise ride quality or safety.
Start with the upper stanchions. These should be smooth, clean, and free of any scoring or pitting. Damaged stanchions not only reduce sealing effectiveness but may indicate internal contamination. Inspect the wiper seals closely—any sign of oil seepage, dust buildup, or deformation signals the need for seal service or replacement.
Examine the lowers for cracks near the arch, dropouts, or air bleed valves. Press gently around these areas to detect any play or flex. Pay special attention to the fork crown and steerer junction. A creaking or clicking sound under pressure is often an early warning of crown/steerer interface wear or delamination.
Air Spring Inspection and Pressure Check
The 36 Factory GRIP2 utilizes a self-equalizing EVOL air spring. To inspect it, release all air pressure first and slowly compress the fork. Listen for hissing sounds indicating air leakage. Apply soapy water to the air valve area—bubbles will form if there’s a slow leak.
After confirming air tightness, recharge the fork to your desired air pressure using a shock pump. Refer to Fox’s recommended pressure chart based on rider weight. Once set, check if the fork reaches full travel during a sag test and under controlled compression. Inconsistent travel or “dead spots” typically indicate trapped air between the positive and negative chambers, resolvable by a manual equalization cycle.
GRIP2 Damper Function Test
The GRIP2 damper offers independent high-speed and low-speed compression and rebound adjusters. Begin by returning all dials to factory mid-settings. Compress the fork manually and observe damping response.
If rebound is slow or inconsistent, internal oil displacement may be compromised. Compression circuits that feel “notchy” or unresponsive during adjustments might point to damaged internal shims or contamination. These symptoms call for a full damper cartridge service or inspection by a certified technician.
Do not attempt to disassemble the GRIP2 damper without proper training and equipment, as its pressurized system requires precision handling.
Wiper Seal and Bushing Check
Wiper seals on the 36 Factory GRIP2 keep oil in and dirt out. With the fork inverted, gently move the stanchions and feel for increased resistance or scraping—this could suggest worn seals or bushing interference.
Check for side-to-side play by grasping the fork lowers and rocking them perpendicular to the axle. Excessive movement may suggest worn bushings or lower leg casting tolerances exceeding spec.
Removing the lowers for inspection requires draining the oil from both legs, then tapping the bottom bolts gently with a rubber mallet. Inspect the inside of the lowers for sludge, metal shavings, or dry wear marks.
Troubleshooting Common Set-Up Issues
Incorrect setup often mimics mechanical problems. Riders may report harshness or dive under braking, which is commonly linked to incorrect air pressure or damper settings rather than fork failure.
A common user error is misalignment of the front axle system. Ensure the pinch bolts are torqued in sequence and the lowers are aligned using the axle float method.
Inconsistent rebound, where one leg returns faster, might be the result of air migration or a partially serviced damper. Inspect and reset air balance and consider a damper bleed or oil refresh if symptoms persist.
Maintenance Intervals and Lubrication Tips
Fox recommends lower leg service every 50 hours of riding. This includes cleaning the internals, refreshing bath oil, and replacing the foam rings and dust wipers. Damper service is advised every 125–200 hours, depending on usage conditions.
Use only Fox 20wt Gold Oil or the specific oil listed in the current Fox service guide. Avoid using generic or automotive suspension oils, which can cause seal swelling or reduced damper performance.
Always lubricate wiper seals and foam rings before reassembly to ensure immediate function and prevent dry stiction.
Optimizing GRIP2 for Performance
Tuning the GRIP2 damper for different trail types involves adjusting all four knobs—high and low-speed compression and rebound. Start with baseline settings, then:
- Increase HSC for big hits or steep descents.
- Lower LSC for a more supple small-bump response.
- Adjust HSR for return speed on hard landings.
- Set LSR to balance comfort during slow-speed compression.
Mark each setting after rides and adjust in small increments. Maintain a tuning log to track performance changes.
Compatibility With Other Drivetrain and Frame Components
The 36 Factory GRIP2 is designed around Boost spacing (15x110mm), with compatibility for both 29” and 27.5” wheel sizes depending on the model year and arch offset. Ensure your hub and frame spacing match before installation.
Brake mount is Post Mount 180mm, and can support up to 203mm rotors with appropriate adapters. Fork steerer is 1 1/8” to 1.5” tapered, requiring a matching headset and frame configuration.
The 36 is not compatible with dual-crown headsets or downhill triple clamps and is intended for single-crown, aggressive trail/enduro use.
Comparing the 36 Factory GRIP2 to Similar Models
Compared to the Fox 34 or Fox 38, the 36 GRIP2 strikes a balance between stiffness and weight. The 34 is better suited for XC and light trail use, whereas the 38 is overbuilt for enduro and freeride.
RockShox Lyrik Ultimate offers similar damping customization but lacks Fox’s small-bump compliance and longer-term reliability in extreme conditions. Riders valuing adjustability and mid-travel stiffness will favor the 36.
FAQs
How often should I service the 36 Factory GRIP2 fork?
Lower leg service is recommended every 50 hours of ride time, while a full damper service is advised every 125–200 hours.
What are signs that the GRIP2 damper needs service?
Symptoms include inconsistent rebound, compression settings having no effect, or audible knocking inside the damper.
Can I use third-party wiper seals or oil?
It’s not recommended. Use only Fox-approved seals and Fox 20wt Gold Oil to maintain performance and warranty.
How do I fix a fork that doesn’t reach full travel?
First, check for trapped air in the negative spring chamber. Perform a manual equalization by fully compressing the fork with zero pressure, then re-inflate.
What is the max rotor size I can run?
The 36 supports up to a 203mm rotor using a proper adapter on the post mount.
Is the Fox 36 GRIP2 compatible with e-bikes?
Some e-MTBs support the 36, but always verify fork travel, axle spacing, and weight ratings with the frame manufacturer.
Conclusion
Performing a suspension fork inspection on the Fox 36 Factory GRIP2 ensures reliable performance, safety, and long-term durability. Understanding the fork’s unique components—from the GRIP2 damper to EVOL air spring—empowers riders to catch wear signs early, optimize performance, and keep the fork functioning like new. Proper maintenance, accurate tuning, and periodic inspection will maximize your investment and trail experience.